The IUCN Red List of Threatened Species 2022.2
Taxonomy database of the U.S. National Center for Biotechnology Information
Global Biodiversity Information Facility
Open Tree of Life reference taxonomy version 3.2
A Handbook of the World's Conifers (1st edition)
Die natürlichen Pflanzenfamilien, 13. Band: Gymnospermae
A dataset on catalogue of alien plants in China
National Library of Israel Names and Subjects Authority File